Photographic-film package for color photography.



I No. 783,613. PATENTED FEB. 28, 1905.

J. T. CLARKE.

PHOTOGRAPHIG FILM PACKAGE FOR COLOR PHOTOGRAPHY.

APPLIOATION FILED JULY 25, 1904.

nvzufoz UNITED STATES Patented February 28; 1905.

PATENT EEicE.

JOSEPH THACHER CLARKE, OF HARROV, ENGLAND, ASSIGNOR TO EAST- MAN KODAKCOMPANY, OF ROCHESTER, NEll' YORK, A CORPORA'llON OF NEW? YORK.

PHOTOGRAPHlC-FILIVI PACKAGE FOR COLOR PHOTOGRAPHY.

SPECIFICATION forming part of Letters Patent No. 783,613, dated February28, 1905. Application filed July 25, 1904. Serial No. 218,003.

To a, whom, it may concern.-

Be it known that I, JOSEPH TnAeunn CLARKE, a citizen of the UnitedStates, residing at Harrow, Widdlesex county, England,

have in vented certain new and useful Improvements in Photographic-FilmPackages for Color Photography; and I do hereby declare the following tobe a full, clear, and exact description of the same, reference being hadto the accompanying drawings, forming a part of this specification, andto the reference-numerals marked thereon.

This invention relates to a novel means for exposing the negativesrequired in the process of three-color photography, and has for itsprimary purpose to provide an assemblage or pack of flexible negativematerial so conjoined with flexible color-screens attached thereto thatthe changing of the negatives from their position in the focus of thelens may be effected with greater rapidity, greater ease, and greatercertainty than has hitherto been possible.

A secondary advantage of this invention is that the color-screensemployed in the improved packs are more economical in cost ofmanufacture and more regular in tint than are the glass screens now ingeneral use and are, furthermore, preserved from fading or otheralterations of tint through the action of sunlight, since they are fromthe instant of their preparation protected from all actinic rays by alight-tight packing.

To these and other ends my invention consists in certain improvementsand combination of parts, all as will be more fully described, the novelfeatures being pointed out in the claims at the end of thespecification.

1n the accompanying drawings, forming a part of this specification,Figure 1 is a perspective view of a film package or carrier adapted formy films and screens. Fig. 2 is a sectional view of a film-packagecontained in an adapter and embodying my invention. Fig. 3 is aperspective view of a sheet of film with its color-screen embodying myinvention and adapted for use in the film-pack.

Similar reference-numerals in the several figures indicate similarparts.

In carrying this invention into effect I pro- 5 vide three sensitizedfilms, each of which may be specially prepared by any of the knownorthochromatic processes, so as to be peculiarly receptive of thosecolor-rays to which they are to be exposed, and I attach to the face 5 5of each of these films a color-screen or lightfilter made byincorporating into a flexible and transparent base a suitable quantityof the dye or stain selected. \Vhen water-soluble dyes are employed forthe coloring of the screens, the base may be gelatin. lVhen the dyes arenot water-soluble, but may be dissolved in alcohol, ether, acetone, amylacetate, or any like fluid which is a solvent of nitrocellulose or ismiscible with a solution thereof, then the base 5 maybe celluloid. Inboth the above cases the screens may be formed by evenly coating thestained vehicle or base (gag-ed to a regular depth of tint by theaddition of a fixed percentage of the chosen dye) upon a glass table, 7preferably by the aid of a mechanical emulsion or lilm coating machine,as will be readily understood by those skilled in the art. When dry, thesubstance of the color-screen is stripped from the temporary supportprovided by the glass and is cut up into such separate sheets as may berequired.

For the process of three-color photography, as is well known, threescreens of different colors, which together cover the entire range 30 ofthe spectrum, are employed. The first of these screens is, in accordancewith the present invention, attached, preferably by pasting at oneedgenamely, that edge in the direction of which the negative is to bewith- 5 drawn to the first sensitized film or to its backing of opaquepaper or like support. The second flexible color-screen is attached tothe second film, and the third screen to the third film in like mannereach to each. The 9 three sensitized films thus united to theirrespective color-screens are then so packed that they can readily bechanged Awh/H/n from the focus ol the lens, the withdranal dicated by 9.

of the first film after exposure leaving the determining the correctsuperposition of the second film, covered by its color-screen, in V 1negativesmay be provided by notches 10, Fig.

position for the second exposure, and so on. Thus for the purpose of thethree color photography at present in vogue each complete color-filmpack will consist of three separate sensitized films or three exposurelengths of lilm, with three screens of different color attached to thefaces thereof, together with such opaque backing-s of black paper orsimilar material as may be necessary to prevent the transmission oflight through one film to another during exposure. Such colorpacks mayof course consist not of three sensitive surfaces only, but of anymultiple of such triple groups, or, and preferably, the packs may beinclosed in special carriers provided with tabs for the separatewithdrawal of each exposure and its adjunct-as, for instance, in thecarriers described in the United States Letters Patent No. 728,718. Suchpacks can, when introduced into the holders or adapters described in theUnited States Letters Patent No. 728,719, be directly applied to anyordinary 1.)hotographie camera for the purpose of making negatives forthe three-color process.

In the embodiment of my invention illustrated in the drawings 1 haveshown the filmpackage contained in United States Letters Patent No.728,718, the casing being indicated by 1, divided by a septum 2 into theholding-chamber 3 and the receiving-chamber 4: for exposed films. Thebackings 5, of black paper, are provided with the separable tabs 6, andthe flexible film (indicated by 7) is attached at 8 to said backing,While the color-screen of flexible material for each film is alsoattached to the film or preferably to the backing 5 at the forwardendsay at the point in- WVhen packs of this kind are made up inaccordance with the principle of the present invention, they willconsist of the following sequence of flexible surfaces: first, thesocalled safety-cover of black paper or the like, for the protection ofthe sensitive surfaces from the light, then the first colorsereen, andbehind this and attached thereto the first sensitive surface, followedby the black backing-paper, a portion of which projects from the carrierin the form of a tab for the purpose of withdrawal. It will beunderstood that all these three-namely, film, screen, and backing-paperare removed from the focus of the lens together and at once by pullingup the first projecting tab. This triple withdrawal having been effectedby a single movement, the second sensitive surface covered by itscolor-screen will be in position for the reception of the second image.So

likewise and in succession after the second withdrawal will be thethlrd.

Register-marks for the purpose of readily pigment-prints to be made fromthe three 1, upon the margin of the exposure-aperture of the carrier.These notches will naturally be reproduced upon the developed films inexactly the same position relatively to the images projected thereuponby the lens, or for the same purpose perforations, such as punc tureswith a needle, may be made through the entire series of films after theyare in position in the pack. The tabs employed for withdrawing the filmsfrom the exposure to the storage chamber of the carrier may have uponthem any suitable markings indicating to the operator the color of thescreen attached thereto, and preferably the tabs of the lillns for eachseries are marked with acorrespomling number or characteristic mark, sothat he may know that he has exposed the whole se ries of filmsnecessary for the production of the three-colornegatives for which thisinvention is particularly adapted.

Packs of films and screens made up in accordance with this invention maybe exposed in the most rapid succession and with perfect ease andcertainty. The employment of a multiplicity of dark backs is herebyrendered unnecessary, the change from one surface to another beingeffected by a single operation and without the removal of the holder oradapter from the camera between the successive openings of the lens. Thethree exposures having been effected, the color-pack is torn apart inthe dark room, the color-screens and backing-papers may be thrown away,and the three sensitized films, representing the images of the threechosen colors of nature, are ready for development.

I claim as my invention 1. A film-package embodying a series ofsuperposed sheets of sensitized photographic film, each film-sheet beingcovered by a differently-tinted color-screen which is movable with it.

2. A film-package embodying a series of superposed film-supportingsheets of opaque material, each sheet having attached thereto asensitized photographic film and a transparent color-screen.

3. A film-package embodying superposed flexible sheets of opaquematerial, each having a flexible photographic film and a flexiblecolor-screen extending over the film thereon, the sheets and films beingarranged in a plurality of similar series and each series containingscreens of three different colors.

1. A film-package embodying superposed flexible sheets of opaquematerial each having a flexible photographic film and a flexiblecolor-screen extending over the film thereon, the sheets and films beingarranged in a plurality of similar series each series containing screensof three clififerent colors, and ineach having a color-screen attachedthereto (heating-marks on the opaque sheets for clesand movabletherewith, said screens extendignating the series to Which it belongs.ing over the face of the film.

5. A film-package for color photography JOSEPH THACHER CLARKE. 5embodying a holder having an exposure-ap- \Vitnesses:

erture and designating-marks at the edges H. D. JAMEsoN,

thereof, a series of sensitized films therein F. L. RAND.

